Breast drill



ma-mmh 3 l 925.

L. LENGYEL BREAST DRILL Filed. Jn 31 1924 @Wouw/14 Patentedl Mar. 31, 1925.

LJN-iran stares LADISLEAS LENGYEL, 0.3? CLYMER, PENNSYLVANIA.

BRE-ST DRILL.

Application aies January ai, i924. seri'ai- No. $59,794.`

T all whom. t may concern.'

Be it known that I, LAnisLnAs LnNeYiir.,

a citizen of Hungary, residing at Clymer,

in the county o-f indiana and State of Penn- Sylvania, have invented certain new and useful mprovements in Breast Drills, of which the following is a specification.

rllhis `invention relates to certain new and useful improvements in breast drills and io has for its primary object to provide a cushioned or resiliently supported shaft to which the drill is attached for holding the 'drill in resilient engagement with the work being operated upon and reducing the transmission of vibration between the drill and the body vof a person engaging the same. With the above and other objects in view that will become apparent as the nature of the invention is better understood, the sameconsists of the novel form, combination and'arrangement of parts hereinafter more fully described, shown in the accompanying drawing and claimed.

In the drawing, wherein like reference characters designate corresponding parts throughout the several'views, v

Figure 1 is a side elevational View of a breast drill constructed in accordance with the present invention, the drill bit and the operating means therefor being illustrated by dotted lines,

Figure 2 is an end elevational view of the breast frame of the drill,

Figure 3 is an enlarged fragmentary sectional view showing the resilient mounting for the rod to which the drill bit is attached,

Figure 4f is a cross-sectional view taken on line IV--IV of Fig. 1,

Figure is an enlarged fragmentary detail sectional view showing the end thrust ball bearing for the drill bit supporting rod,

Figure 6 is a plan view of the connected plate members supporting the bearing ball, and

Figure 7 is a plan view of one of the retainer plates for the bearing ball.

Referring more in detail to the accompanying drawing, there is illustrated a breast drill including a breast frame of U-shape formation having a cross plate 1 and angularly bent end arms 2 to which a U-shaped frame plate is attached, the frame plate including a cross plate 3 and angularly bent end arms lv having. their free ends secured as at '5 to the breast plate 1y as clearly shownfin'Fig. 1. l, y y y Ak socketmember 6 is'resiliently `supported upon the breast and frame 'plates 1 and 3 respectively, the socket member 6 freelyv ro'ectino' through an o eiiinc-` 7 centrall formed in the frame plate 3, the socket` member carrying an enlarged head `8 upon the inner end of which there is provided with an opening affording aniinrestrict'ed passage through the socket member 4and head with the 'latter disposed inwardly of the frame plate 3 for limiting outward movement thereof. Diametrically opposite arms 9 lare carried by the head 8 4and are:v provided `adjacent vthe outer ends thereof 'with openings 10 through which rods 11 freely 'e'X- tend. The headed ends 12 ofthe l,rods 11 are anchored to the breast plate 1 while ILthe forward Vends thereof are threaded as at 413 and freely extendthrough openings 14v in the frame plate 3 to have securing 4nuts ,v

15 mounted thereonv to vretain the bolts 11 in position. A coil spring 16 surrounds veach bolt 11 between the breast plate 1 and the arms 9 of the socket'member 6 for Lre'sili'ently supporting the socket member and retaining thesaine tensioned in an outwardf'direction.

head 8 carried thereby has an end thrust bearing lball disposed therein, a pair of ball retainer plates 17 in the form of disk membershaving central openings surrounded by concaved ball engaging feet 18V and provided with opening 19 permittingthe retainer plates being retained in assembled position by the screw members 20 encloses opposite sides of a bearing ball21 as clears ly shown in Fig. 5. The bearing ball and retainer plates are inserted in the headed end of the socket member 6, the outer plate 17 engaging the shoulder 22 formed upon the inner wall of the socket member while a screw plug 23 threaded into the head 8 as at 24 carries a block 25 having a concave seat 26 in its outer side that vreceives the bearing ball 21.

A drill bit supporting rod 27 is freely mounted in the socket member 6 asshown in Figs. 3 and 5 and engages at its inner end the end thrust bearing ball 21. .As shown by dotted lines in Fig. l, a sleeve 28 has a swivel connection 29 with the rod 27, the rod projecting outwardly of the sleeve 28 and having a. drill bit 30 detachably connected thereto in any suitable manner. A bracket arm 31 carried b y the sleeve 28 rotatably supports a shaft journaled in the bearing 32, the outer end of the sha-ft having a crank handle 33 secured thereto while the inner end of the shaft in the bearing 32 extends beyond the angle bracket 81 and carries a. bevel gear 34 that meshes with the bevel gear 35 keyed to the rod 27., A gripping handle 36 projects trom the sleeve 28 diametrically opposite the angle bracket 31 so that the handle 86 may be gripped by one hand while the other `hand or the operator is employedV for operating the crank circuit 3.

In the use of the drill, the body of the person using the same is moved with pressure against the breast plate 1 and the drill foot 30 is forced into engagement with the work, the engagement between the drill bit and the work being cushioned by the coilsprings 16 that are compressed by the rod 27 rotating in the socket member 6 and engaging the hand thrust bearing ball 21 to move the socket member and lateral arms 9 carried thereby inwardly toward the breast plate 1'to compress the coil springs 16. It will therefore be seen that during the entire use of the drill, the drill supporting rod 2'? is resiliently supported and that shocks and vibration incident to the use thereof or partially removed from the breast plate 1 and absorbed by the spring devices 16 and the resiliently supported socket member 6.A

f Vhile there is herein shown and described v the preferred embodiment of the present invention, it is nevertheless to be understood that minor changes may be made therein without departing from the spirit and scope ot' the invention as claimed.

W hat is claimed as new is 1. lna breast drill of the type described, a b-reast plate, a frame plate secured to the breast plate, a drill supporting` socket mem ber resiliently mounted upon the frame and breast plate, a manually operable drill sup'- ported in the socket member, the resilient mounting tor the socket member including spring devices interposed between the frame and breast plate and constituting a support ior the socket member.

In a breast drill of the type described, a breast plate, a frame plate secured tothe breast plate, a drill suppmting` socket member` resiliently mounted upon the frame and breast plate, a manually operable drill supported in the socket member, the resilient mounting for the socket member including a' pair or rods extending between the breast and frame plate, coil springs surrounding the rods and lateral arms carried by the socket member freely slidable upon said rods and engaging the outer ends of said springs. A

8. ln a device of the kind described, a breast plate consisting o1 a substantially U-shaped bar, a frame plate consisting of a U-shaped bar having its legs secured to the breast plate and provided with a centrally disposed opening brace rods connecting said plates at opposite sides of'said opening, a socket carrier having arms slidable on said rods, springs surrounding the rods between the socket carrier andl breast plate, and a socket supported by said carrier and reciprocable through the opening in the frame plate.

ln testimony whereof I aiiX Amy signature. h

LADISLEAS LENGYEL. 

